如何在命令提示符下运行由 intellij 创建的 java 程序

Question

How do I run my Java program in command prompt, my project was created in Intellij, and I am having difficulties running it in the command prompt...without using the Intellij in creating project,I can run the java program in command prompt.

I do this like this.

java myjava ->this would work.

but the project created by Intellij,this is the path.

C:\myjava\sampl1\src\com\myexample\test>

when I issue this command

java myjava -> Error: Could not find or load main class myjava

but I am inside in that directory.

Thank you in advance.

Answer 1

Three issues:

1. You have to specify the fully qualified class name (that means including the package name) to the java command. It looks like your myjava class is in a package com.myexample.test . So its fully qualified name is com.myexample.test.myjava .

2. When you run the java command you have to be in the directory that is at the base of the package hierarchy (or put that directory on the classpath).

3. You're using the src directory, which contains .java source files, but the java command expects compiled .class files, so you need to use the project's output directory. Its location in your project will depend on your IDE and configuration but it will contain same-named structure as inside src , except with .class files instead of .java files.

In your case, navigate to:

C:\myjava\sampl1\out\production\

Then run:

java com.myexample.test.myjava

Answer 2

I hope this can help somebody, a little late but, just I had this problem, ok my solution it next: 1. Run your code normally and copy the command line that the IntellijIDEA made, see the screenshot.

2.Copy and paste the command line that it uses to use with your params.

Answer 3

It looks like the class is in a package com.myexample.test . Try running

java com.myexample.test.myjava

from the project's bin directory

Answer 4

From intellij, open your project structure, and click on Modules. You'll be able to see the output path. Usually, it's something like (if on mac):

~/../out/production/{context}.

Back to your example in windows. The path you gave is, C:\\myjava\\sampl1\\src\\com\\myexample\\test>, so you have your project in : C:\\myjava directory where your context (or project name) is sampl1 . That means that your output (*.class files) will be in

C:\myjava\sampl1\out\production\sampl1

Navigate into the folder and then run the command: java com.myexample.test.myjava

Answer 5

In my terminal the current directory is the root project directory named Practice.
When you issue the java command make sure to specify the classpath using the -cp flag.
The classpath will extend from your project root directory through out/production/<project name> .

For example, my classpath was:
-cp /Users/ashton/java/IdeaProjects/Practice/out/production/Practice

Then you add a space, then the package name including class name you want to run, then any parameters. So the entire command including parameters was this:
java -cp /Users/ashton/java/IdeaProjects/Practice/out/production/Practice us.debie.ian.ljbe.FileSearchApp one two three

You should be able to piece it all together by examining the screenshot below to see what current directory is in, what classpath was specified, etc.

Answer 6

If you were using a Maven project for example, Just locate the relevant .class file under /target folder. Then execute it using 'java' command like you would typically run any application.